Cancer is often the results mutations that involve ________.
A. Genes in the mitotic spindle
B. Proto-oncogenes mutating and becoming oncogenes
C. Oncogenes mutating and becoming proto-oncogenes
D. Both proto-oncogenes and oncogenes mutating
Answer: B
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What is the difference between a coenzyme and a prosthetic group?
A) Coenzymes are essential for an enzyme's function and prosthetic groups only enhance its reaction rate. B) Coenzymes are weakly bound whereas prosthetic groups are strongly bound to their respective enzymes. C) Coenzymes are organic cofactors and prosthetic groups are inorganic cofactors. D) Coenzymes require additional ions to bind to enzymes but prosthetic groups are able to directly interact with enzymes.
In the early 1900s, many people, particularly in the southern U.S., suffered from infections
with parasitic hookworms. Many of these hookworms feed on blood cells of the host and thus also consume iron that is found in red blood cells. A symptom of a heavy infection is a craving to eat dirt—particularly clay-like soils with a high iron content. Thus, for these people, iron is a __________.
a. tradeoff b. constraint c. part of the organism’s niche d. nonlimiting resource
In order to cause vasodilation of most muscular smooth muscle,
A. Acetylcholine combines with nicotinic receptors B. Norepinephrine combines with alpha receptors C. Norepinephrine combines with beta 1 receptors D. Acetylcholine combines with muscarinic receptors E. Sympathetic stimulation is removed
There will be approximately ____ mice in four
months in a population of 1,000 mice where 500 mice are born and 400 mice die monthly. a. 1,060 b. 1,160 c. 1,260 d. 1,360 e. 1,460